There was the bear that starved itself to death after its mate died, there are dogs that basically wail out when something is troubling them. In a book called "Mapping the Mind" I read that pain is directly related to emotions. This is why when your mind is on something else you wont feel pain as much. Have you ever seen that video with that woman who walked around a store with a knife in her back and never knew? Anyways, while animals may not produce tears for pain, it has nothing to do with their intelligence (I only mention this because someone on the Internet as I was browsing for answers seemed to think that crying with tears is related to intelligence ).
However there do seem to be at least some animals that cry for the same reasons...or at least the same stimuli.
There is a marine mammal called the Dogong which lives in the Indian Ocean who sheds real tears when in trouble or pain.
Another note, my dog showed signs of depression, and would lay down outside and not even bother to swat the flies away, on some days, and then other days he would be chewing his ass to get the bastards away.
I would cover laughter but that is useless since it has already been covered.
Humans cry and laugh for specific reasons, probably communicative, you might say, then why do you cry or laugh alone? Because the "reason" for it may not be the same as the...well the best word I can say is "calling" for it. There is no reason to think other animals don't have the same "calling" with a different result. We happened to have developed crying/laughing, other animals have things like sweat, shrieks, movements, color change, etc.
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